Transcript for Robin Williams Talks About Addiction in 2006 Interview With Diane Sawyer

Robin Williams wasn't one to hold back -- often turn those personal struggles and the punch lines and had a very different tone when he sat down with Diane it was a -- candid conversation in 2006 and here's a bit more about his honesty. About his addiction. Was there. One moment. That -- felons -- -- was it one day changes are gradual is standing at a precipice and -- founders have for instance the little corner of course for growth. This is -- December's -- -- -- -- -- -- -- -- -- -- -- -- Someone who has no tolerance for oppressed -- possibility. To talk about it that's caused by something that -- -- it's just there just in its -- and waits. It's -- -- -- -- waiting for the time when you think this time I'm OK and then it. And then next thing you know it's not okay. Is -- folks. This sadness. About these past two years from. Own. There's a sadness and then you have to go vendors also. There's also hope -- send -- it's almost like. You know everything you wish they hadn't happened but they did and the purpose is to make it different this political Buddhist gift I would called him a Christian gift it's -- idea of you're back and you realize the thing that matters are others. Way beyond herself. -- goes away you go -- -- Realize there -- a lot lot of amazing people out there to be grateful for. The loving god and that other Matt. Good luck. That's what life is about.

This transcript has been automatically generated and may not be 100% accurate.